The Method Of Dating Fossils By Their Position In Rock Layers Is Called

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What is the method called of dating fossils by comparing . . .
Dating Fossils in the Rocks | National Geographic Society
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Scientists arrange the fossils and rock layers from older to younger to determine the age of different rocks . This method is called relative dating .
It is based on the Law of Superposition which states that in undisturbed rock sequences the bottom layers are older than the top layers . Therefore, some discovered fossils are able to be dated according to the strata, a distinct layer of rock , that they are found in . Another common way that fossils are dated, is through radiocarbon dating .
One way of dating fossils relies on their relative positions in the ground . When paleontologists dig deeper in sedimentary rock they are, in effect, looking back in time . As sediments carried by wind and water accumulate, they bury older layers—so the bottom layers in a geological sequence are usually the oldest and the top layers the youngest .
It's often much easier to date volcanic rocks than the fossils themselves or the sedimentary rocks they are found in . So, often layers of volcanic rocks above and below the layers containing fossils can be dated to provide a date range for the fossil containing rocks . The atoms in some chemical elements have different forms, called isotopes .
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This dating method is called biostratigraphy (aka faunal correlation); it uses "index fossils " plus the "Law of Superposition" (younger strata on top of older) .
The main relative dating method is stratigraphy (pronounced stra-TI-gra-fee), which is the study of layers of rocks or the objects embedded within those layers . This method is based on the assumption (which nearly always holds true) that deeper layers of rock were deposited earlier in Earth 's history, and thus are older than more shallow layers .
The first method is called relative dating . This considers the positions of the different rocks in sequence ( in relation to each other) and the different types of fossil that are found in them . The second method is called absolute dating and is done by analysing the amount of radioactive decay in the minerals of the rocks .
Another common method , uranium-lead dating , relies on the radioactive decay of uranium and can be used to date rocks containing the oldest known fossils on Earth—older than 3 .5 billion years old!
Fossils found in a particular rock layer help scientists determine the age of the rock . Scientists use a technique called radiocarbon dating to find out the age of the fossils . Once they know the age of the fossil in the rock , they also know that rock itself is about the same age!
The boundary between these periods ( the K-T boundary) is marked by an abrupt change in fossils found in sedimentary rocks worldwide . Its exact location in the stratigraphic column at any locality has nothing to do with radiometric dating — it is located by careful study of the fossils and the rocks that contain them, and nothing more .
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The Method Of Dating Fossils By Their Position In Rock Layers Is Called

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